Fishes
   Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838
     Order Hexanchiformes Compagno, 1973 - six-gill sharks
       Family Chlamydoselachidae Garman, 1884 [monotypic] - frill sharks
         1 Genus Chlamydoselachus Garman, 1884